The command above gives me the payoff of an call option, unfortunately the x-axis goes from -2 to 20, but I would like to see the x-axis from 0 to 20, so the starting point should be y=0 and not y=-2. However the plot should still show the y-axis from -2 to 10 and the negative values for y

but that way, the y axis doesn't goes to -2, it stopps at 0 and although I want the x-axis to start at the point where x is zero and y is zero (and not y=-x and x=0) I also need to see the negative y values